This is a cron job entry to that will auto renew your Let's Encrypt certificate automatically by running 2 times a day evey 12 hours on a random minute.
You can add a cron job entry by running this command
$ crontab -e
Then past the following snippit in that file, Note that lines 1-3 might not be required at all. Make sure your check the link to the thread regarding this.
I'm not a DevOps/Server guy, so any improvements are highly appreciated.